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Evaluation of an analytical approach predicting the transversal failure load of insert connections in sandwich structures

Wolff, Johannes and Trimpe, Fritz and Zerlik, Ralf and Hühne, Christian (2015) Evaluation of an analytical approach predicting the transversal failure load of insert connections in sandwich structures. 20th International Conference on Composite Materials (ICCM 20), 19.-24.07.2015, Kopenhagen, Dänemark.

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Official URL: http://www.iccm20.org

Abstract

The main objective of this work is to develop an analytical tool to predict failure loads of separable insert joints of sandwich structures. Insert connections provide several bonding interfaces to the honeycomb core as well as to the skin sheets, varying in number, position and size depending on the insert type. The idea is to improve these load paths on their quantity, quality and transferring load portions. With this paper the current status of this investigation is provided. Through-the-thickness insert connections are selected for experimental benchmark testing due to their high load-to-weight ratio. The first failure mode under transversal loads is shear buckling of the honeycomb core cell walls. This failure type is evaluated by a convenient applicable, semi-analytical equation, recommended by ECSS [1]. This formula is based on the “simple sandwich theory”, considering the design parameters core and skin sheet thickness, core shear strength, honeycomb cell size and insert radius in linear dependence. In contrast, the face sheet flexure stiffness as well as core density is not considered within the analytic equation, though their influence is not negligible. If significant tendencies of these non-considered parameters are deductible, the analytical approach could be extended. Therefore, analytical predictions are compared to benchmark test data taken from several sources. The analytical predictions show sufficient correspondence to the test data results, confirming the assumption of a linear dependency of the considered design parameters.

Item URL in elib:https://elib.dlr.de/102037/
Document Type:Conference or Workshop Item (Speech, Poster)
Title:Evaluation of an analytical approach predicting the transversal failure load of insert connections in sandwich structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wolff, Johannesjohannes.wolff (at) dlr.deUNSPECIFIED
Trimpe, Fritzfritz.trimpe (at) dlr.deUNSPECIFIED
Zerlik, Ralfralf.zerlik (at) zodiacaerospace.comUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.deUNSPECIFIED
Date:15 May 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Sandwich, insert, joint, honeycomb
Event Title:20th International Conference on Composite Materials (ICCM 20)
Event Location:Kopenhagen, Dänemark
Event Type:international Conference
Event Dates:19.-24.07.2015
Organizer:Scandinavian Organising and Scientific Committee
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old), L - Structures and Materials, L - Systems and Cabin, R - Vorhaben Landetechnologien, R - Raumfahrzeugsysteme - Konzepte und Entwurf
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Wolff, Johannes
Deposited On:13 Jan 2016 16:31
Last Modified:13 Jan 2016 16:31

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